A2103 Standard Optical-Contact Tachometer


SKU: A2103 Category:


The A2103 Standard Optical-Contact Tachometer is fully featured including 5 digit LCD inverting display with legends for all functions and measurement parameters, other features include selectable ranges for revolutions, metres, feet, yards per minute or per second, with additional features for maximum, average and minimum reading capture, last reading hold, count revolutions or length and time modes.


  • Optical Range: 50mm – 1000mm
  • Optical Angle: ± 45° degree
  • LED Light Source

Capture Mode

  • Maximum Speed: Captures maximum speed
  • Minimum Speed: Captures minimum speed
  • Fast Time-base: 0.1 seconds in Capture mode
  • Average: Averages over last 8 readings

Contact measurements: With the A2100/01 Contact Adaptor fitted as Supplied, Revolutions, Metres, Feet, Yards per Minute or per Second.

Maximum speed via Contact Adaptor: Governed by upper speed limit of bearings and is affected by measurement duration, typically 50,000 rpm for 10 Seconds. Maximum linear rate is typically 1,500 metres/minute or 4,500 feet/minute.

Scope of Supply

  • Instruction Manual
  • A2103 Standard Optical-Contact Tachometer
  • Carrying Case
  • Reflective Tape
  • Certificate of Calibration
  • A2100/01 Advent Contact Adaptor

Display Inverting LCD Vertical 5 digit display
Display Functions 180° degree Inverting
On Target Indicator Yes
Low Battery Indicator Yes
Function Icons Comprehensive selection of ranges shown in display
Optical Range 50mm – 1000mm
Optical Angle ± 45° degree to reflective marker
Light Source Minilamp
Measurement Modes rpm & rps optically (Also Count & Time)
rpm & rps, metres, yards, feet, per minute & per second via contact adaptor
Count total revolutions, metres, feet, yards
Measure Time interval in seconds between pulses (Reciprocal rate)
Speed Capture feature, Maximum, Minimum or Average rate
Speed Range – Optical 3 – 99,999 rpm (Or equivalent in rps)
Speed Range – Contact Maximum 50,000 rpm for 10 seconds (Or equivalent in rps)
Linear Speeds – Maximum 0.30 – 1500.0 metres or yards/minute. (4,500 feet/minute) Or equivalent in seconds
Revolution Range Features Fully Auto-ranging up to 0.001 digit or ± 1 digit fixed, User selectable
Accuracy Speed Modes Only 0.02% ± 1 digit
Count Mode Revolution ± 0.1 metres (Or equivalent in all ranges)
Time Interval Mode 0 – 99,999 seconds Auto-ranging only (Maximum 0.01 revolution)
Time-base Standard 0.8 seconds or time between pulses
Time-base Fast Modes 0.1 seconds auto-selection in Maximum or Minimum capture mode
Memory Features Last reading held for 1 minute, Auto Switch Off
Program settings retained in memory after power down off
Power Requirements Batteries not included, 4 x AAA batteries are required

PDF Files Available to Download

Instruction Manual